I think aviation is pretty well-suited to carbon taxes/offsets. There are only a few major players and it would be very easy to enforce. Also I think the market would rather easily bear a 30% increase in flight costs
The government has always defined the bottom (above physics), and they can certainly boost the bottom up by 30%. Remember when pretty much everyone took the Greyhound?
Sure, but that doesn't mean we can't pay its actual cost. I would be for that, as long as every last cent was used ofset the CO2 in the most effective way possible.